Explain in a few sentences the main idea presented in the article below.

The majority of the world's senior citizens are supported by pensions, either from the government or their previous employer. These pension systems are structured to provide a steady income stream post-retirement. However, there is growing concern about the sustainability of these systems due to the increasing proportion of elderly in the population. As lifespans increase and birth rates decline, a larger number of retirees will have to be supported by a relatively smaller working population. This demographic shift puts pressure on financial resources, compelling governments and organizations to consider revising the terms, benefits, and eligibility criteria for pensions.
Explain in a few sentences the main idea presented in the article below.

The majority of the world's senior citizens are supported by pensions, either from the government or their previous employer. These pension systems are structured to provide a steady income stream post-retirement. However, there is growing concern about the sustainability of these systems due to the increasing proportion of elderly in the population. As lifespans increase and birth rates decline, a larger number of retirees will have to be supported by a relatively smaller working population. This demographic shift puts pressure on financial resources, compelling governments and organizations to consider revising the terms, benefits, and eligibility criteria for pensions.
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The article highlights the concern over the sustainability of pension systems due to the rising number of elderly individuals and a shrinking working population. As lifespans increase and birth rates decline, fewer workers will be supporting more retirees, putting financial strain on pensions. Therefore, there is a need to reconsider the terms and benefits of these systems.
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Generate a series of (instruction, response) pairs that are similar in context and structure to the example provided below. Each pair should consist of a concise instruction followed by an appropriate, detailed response. The instruction should pose a clear task or question, while the response should provide a comprehensive answer or solution that could be understood by someone with a basic understanding of the subject.

Example pair: 
Instruction: In just a few sentences summarize the text below.

That said, Rosberg has improved his race craft this year, beating Hamilton legitimately in Spain and Austria. But if he cannot reverse the qualifying trend, he is going to find it nearly impossible to beat Hamilton to the championship.

Although Rosberg usually remains upbeat—at least in public—following his qualifying near-misses, it must be weighing on him psychologically to know that Hamilton has stolen his one edge from last year.

The current record for poles in a single season is 15, set by Vettel in that dominant 2011 campaign. Hamilton is currently on pace to break that standard, as well as Nigel Mansell's record of qualifying on pole for 88 percent of the races in 1992 (Hamilton would need 17 poles to break that mark).

Records or not, though, Hamilton would probably settle for his third drivers' championship—and his qualifying performances thus far have him well on his way.
Response: Although he has improved as a racer this year, Rosberg has to find a way to beat Hamilton in qualifying. It will be nearly impossible to surpass him for the championship. Fifteen is the current record for poles in one season, but Hamilton is currently on pace to beat that record. If his dominance in qualifying sessions continues, it seems inevitable that Hamilton will win a 3rd driver's championship.

Your task is to generate more pairs that maintain this level of clarity and detail. The topic is Summarization. Write a long text of instruction by yourself, then summarize the given instruction in a response. Ensure that the responses are informative and accurate, suitable for an educational context. 

Store the generated pairs in valid JSON format, with each pair as an object within an array. Each object should have two key-value pairs: "instruction" and "response". For instance: 

{"contents": [{"instruction": "text", "response": "text"}, {"instruction": "text", "response": "text"}, ...]} 

Remember to maintain consistency in the format and ensure the generated pairs are diverse and cover a broad range of subjects. You must return the response in the asked format and you must not add any additional text in your response.
